Perhaps you should try some spelling variations:
nang doc » nang luc
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
doc hoi » duoc hoi, hoc hoi, doc hai
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
luc van » luoc van, luu van, luc va
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach tu nang doc hoi. hieu vu cham ((luc van) OR (duc van)) hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tu nang doc hoi. hieu vu cham ((luc van) OR (duc van)) hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach tu nang doc hoi. hieu vu cham ((luc van) OR (duc van)) hanh vi cua tre*.